[USRP-users] Long time for USRP N210 to respond -- is this v3.10, firewall problem, or something else?

Marcus Müller marcus.mueller at ettus.com
Sun Mar 20 14:31:55 EDT 2016

Hi Susan,

could you send the full output of uhd_usrp_probe? Is the delay /always/
happening after the  "current send frame size" line?

The difference between UHD 3.8.4 and a recent version is indeed strange;
UHD hasn't changed communication semantics, which means it's probably
not the firewall.
In fact, I don't think much N210-network-related code has changed since

So, could you send both the output of uhd_usrp_probe with the
daughterboard installed and without, just excluding that as an error
source. Does the delay occur in both cases?

Best regards,

On 20.03.2016 17:13, Mendel, Susan Marie via USRP-users wrote:
> Marcus,
> I get the same long delay with uhd_usrp_probe but not with uhd_find_devices.
> Can I expect things to work OK through the firewall as long as I'm specifying the IP address or is it likely to cause other problems down the road? 
> I'm going to try to install a released version now but I suspect  I will have the same problem. I was seeing a similar delay on a Windows laptop when I was trying to send data using the Matlab USRP support package. I didn't have the laptop long enough to trouble shoot the problem, which I'm guessing is in my system configuration some where. 
> Thanks,
> Susan
> On 03/18/2016 10:01 PM, Mendel, Susan Marie via USRP-users wrote:
>> In installing UHD on a new laptop, I very stupidly installed version
>> 3.10 instead of the latest release. I didn't use git clone -- I tried
>> but that failed, I think due to my firewall, so I grabbed the zip.
>> When I send a command to the USRP N210, there seems to be a 30 second
>> or so delay before I get any response. For instance the command
>> tx_waveforms prints out "current send frame size" and then it will be
>> a long time before I see anything else. Things seem to work fine once
>> it starts sending. Using the same command on a computer with v3.8.4
>> installed and the same USRP, there is no long delay.
>> I haven't disabled the firewall because I may need permission to do
>> that. Meanwhile I'm specifying the USRP address in the command. Is the
>> firewall likely causing the delay?
>> Secondly, if I were to try building an earlier version instead, what
>> all do I need to remove first? The lib64/uhd directory?
>> Thanks for any help
> A delay isn't normal.
> What happens if you use uhd_usrp_probe:
> uhd_usrp_probe --args addr=       (or whatever the IP
> address of your N210 is)
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